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Dynamic Load Compensation

What is the DLC System?

The DLC system combines a measuring and control system with a newly developed Dynamic Load sensor. It was created to reduce a major contributor to calibration errors. A dry-block instrument has some inherent error mechanisms, including the affect on calibration accuracy that a sensor under test may add. The sensor transmits energy to and from the calibrator. This heat exchange between the calibrator and the environment has a considerable negative impact on the calibration accuracy. The extent of the error depends on many factors, including sensor size (diameter and length), number of sensors in the well, and the difference between calibration temperature and ambient temperature. In other words, calibration accuracy is directly influenced by the actual load of the calibrator.

How Does the DLC System Work?

JOFRA temperature calibrators are already famous for their active dual-zone calibration principle. With the DLC system, we have taken this well-proven and acknowledged dual-zone principle one step further. The load compensation is now active both within the heating block and inside the insert during calibration. The DLC sensor measures the actual temperature difference between two defined points inside the insert. The DLC sensor is designed to provide input to the heat control system of the calibrator to ensure that the axial gradient deviations in the lower 60 mm of the insert are kept to a minimum. The temperature difference between the bottom and the zone at 60 mm from the bottom is controlled within a few hundredths of a degree. The DLC system reacts immediately to changes in the load of the insert and controls the heat distribution to achieve the minimum axial gradient.

Read the full technical note here.